It may be your first or the tenth job interview, and you may either be a fresher or an experienced professional. The selection of a candidate for a definite job, is dependent on a number of factors. Your academic qualification and work experience, your skills and aptitude. And one of the most essential areas which is intrinsic to the selection process, is how you conduct yourself at the interview, which includes your answers, knowledge based questions, and your queries. The last may not be the most important,but definitely a question that is out of context or is proof of your immaturity, will automatically dry up your opportunity, even though you may be the most eligible applicant. Sad, but true!

Tell me something about your company

A candidate is expected to find out about the company before hand. Doing so will tell the interviewer that you are keen on getting the job and also sincere and serious about it. In depth knowledge is not demanded, and you can ask about your job profile in detail and what will be expected of you. But a direct question about the company, its profile and area of function, is a deterrent. So under no circumstances should you ask this question. 

When do I get an increment?

This question is a strict no-no. You may want to know, it is natural. But letting the interviewer know, is a grave mistake. It will only prove that you are only concerned about the monetary benefits. 

When can I start?

If you are the chosen one, the company will let you know that and will also notify as to when you should start work. But till you get the offer letter, you should not ask the question. Do not show the employer that you are desperate or over excited. Some candidates believe foolishly that if they show eagerness to join and start work, the employer will get wooed and give you the job.. but this is a misconception. You will get the job only if you are suited for it. And do remember that the head of a company is an experienced person, who may have interviewed hundreds, and may misunderstand your interest as pretense and a way to pleas him. So avoid it. 

When will I get a promotion?

Instead, ask what is the potential for growth. That will include promotion, increment and other concerns. This question is appropriate and shows your interest and determination to work and succeed. A person who is keen on personal growth is sought after, but not one who is merely concerned about promotion and salary hike. 

Do you need reference about my previous performance?

If the company wants to get a feedback on your previous performance, it will call your ex- employer. And usually companies have resources to find out about a candidate. So you should not reduce your chances and give a dubious impression. Are you not sure about yourself that you need somebody else to prove it? This question may arise in the mind of the interviewer. 

How many leaves do I get?

You should not ask this question at all. If you get the job, you will come to know this from the Human Resource Department, and usually very company has the same number of holidays. 

Do you work on Saturday?

During the interview stage, you should avoid asking this. If you have a genuine reason, like a weekend course or anything else, you should let the interviewer know. But asking this question bluntly is improper, immature and non permissible.

What is the notice period in this company?

Even before you have joined, asking about how you can leave the company, is quite paradoxical. So avoid at all costs.